Depending on what modem was issued to you by Comcast, it could be connected to your computer by either a USN cable or a LAN cable. If you availed of the "free self-install kit", then you would need to buy a LAN/Ethernet cable, as to my understanding Comcast does not issue this with the modem/router. Additional information may be sourced from here.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Your query "Is the connection to the modem a USB cable or telephone cable?"

Response - neither, the Comcast would need a LAN cable to connect the modem to the desktop PC. it is a bigger version of the telephone connector with more wires inside a rounded cable rather than a thin flat one of the telephone.

Hi again,

Your query "Is the connection to the modem a USB cable or telephone cable?"

Response - neither, the Comcast would need a LAN cable to connect the modem to the desktop PC. it is a bigger version of the telephone connector with more wires inside a rounded cable rather than a thin flat one of the telephone.

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Related Questions:

If your operater gave you modem and all cables, connect telephone cable into switch, then one part from switch goes to your telephone and other into modem, also yellow cable goes into modem and into pc.

dont forget to plug in power outlet on modem. for other settings you should call your operator

Yes it is perfectly OK. Remember that a fax essentially works as a phone, so you would run a line from the RCA modem to your fax card, then from the fax card to your telephone. In this scenario you would have to accept your faxes manually though.

Currently, the most common way to connect a desktop system to the internet, is by using the network jack to connect to a broadband cable modem or DSL modem. To do either you must have the service from either you cable provider or phone company (For DSL) and have the modem device for the service. Fees run $20 to $50 a month depending on speed you subscribe.
You connect the device to the system using a CAT5 network cable to a RJ45 (8 wire telephone type jack). Some Cable/DSL modems also have USB connection capability for the few systems these days that do not have a built in RJ45 connector To use them, you install the associated software, then connect the USB cable when prompted.
If you don't have Cable/DSL then dial up telephone modem is the next option, this requires a telephone modem that has an RJ11c telephone cord jack connection, most current computers only have a telephone modem as an option, but they can still be bought for around $20 and you will require a dial up internet service (Few remain, one is Netzero in the USA)

First try connection the Yellow ethernet cable from the rca modem to your computer's network connection. If you get a connection this way, then your modem will work with a ethernet cable. If not, then call Comcast for help. The modem ethernet out to computer port must be connected to the wan line of the router. Then you can connect an ethernet cable from your computer network connection to one of the 4 ports of the router. For wireless connections you must set up the router and wireless adaptor with the same settings to connect. Follow the routers directions.
Good Luck

Unless you have 'VOIP' telephone service with Comcast, your FAX will connect through your home's telephone line, not the internet (or modem). You would connect your phone line to the all-in-one printer, then follow Dell's instructions for use. Good luck!

Is your computer connected directly to the cable modem from comcast and what type of connection if it is?(USB or Ethernet/LAN-its look like a telephone chord for slightly larger) or are you using a router?

First thing that you need to check is the actual modem(box provided by comcast normally the brands are; arris, motorola, webstar, samsung or linksys. Make sure the LED light on the front of the modem that say's either Online/Ready/Cable/nternet is stable or solidly lit.

Go to Control Panel and look for Network and Internet or Network and Sharing Center, on the top left hand side you will find tasks, look for manage network connection and check if you have a local area connection, right click the icon and go to Status then Details. Check if you have an IPv4 IP address(58.x.x.x or 271.x.x.x or something like that) if the IPv4 show as 169.254.x.x(where x can be number s from 0 to 254) its an invalid IP or your computer is not getting any valid IP from Comcast.

try shutting of your computer then shutting off the modem, the modems have batteries you might have to remove them theres usally a panel on the bottom, in the back you should have a wire for comcast cable and an ethernet chord telephone too if you have everything. also your modem could be broken, i had the same problem

This is where you should be in contact with Comcast Tech Support 1-888 262-6300.
The INSTALL tech should have had you on-line before he left.
You need to conect your TV/Computer Cable to a Cable modem and a CAT 5 cable to your NIC (Network Interface Card)
All the lights on the modem should be on except the TEST light and the DATA light should be blinking.
You may have OLD drivers for the Cable modem, download those from another computer from the modem MFG.
Nothing else is required.